ACTA

Magnetic Field Induced Slow Magnetic Relaxation in KEr(MoO₄)₂

V. Tkáč^a, A. Orendáčová^a, R. Tarasenko^a, D.M. Pajerowski^b, E. Čižmár^a, M. Orendáč^a, A.G. Anders^c, M.W. Meisel^b and A. Feher^a
^aCentre of Low Temperature Physics of P.J. Šafárik University and SAS, Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia
^bDepartment of Physics and the National High Magnetic Field Laboratory, University of Florida, Gainesville, Florida 32611-8440, USA
^cB.I. Verkin Institute for Low Temperature Physics and Engineering of NASU, Lenin Av. 47, 611 03 Kharkov, Ukraine

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The spin dynamics of a layered magnetic insulator, KEr(MoO₄)₂, have been investigated in a magnetic field applied along the easy axis at temperatures where the magnetism is dominated by the occupation of a ground doublet. More specifically, the DC magnetization and AC susceptibility were studied in magnetic fields up to 5 T and at temperatures ranging from 1.8 to 20 K. The temperature dependence of the AC susceptibility suggests a slowing down of magnetic relaxation with increasing magnetic field. The magnetic field dependence of the AC susceptibility, studied at nominally 2 K, indicates the presence of low-field, intermediate-field, and high-field regimes characterized by the interplay of internal and external magnetic fields that give rise to different relaxation processes.

DOI: 10.12693/APhysPolA.127.353
PACS numbers: 71.70.Ch, 75.30.Gw, 75.50.Xx, 75.78.-n